Implement for collapsing hollow rivets



July 13, 1948. E. HlLER IMPLEMENT FOR COLLAPSING HOLLOW RIVETS Fil ed Nov. 6, 1946 ATTORNEY Iatented July 13, 1948 his? H ke, G lraifla Te Apn1icat onNnv.embe ,1 46 ;'Seria1 No. 107,999

3; Claims. (01. 2 13 19) 1 This nventione ate to: ma h ne r nstall? 3 bl nd r vet endt. has na ic la re e e to a ma h ne o mste i and o apsin h ll?? nt c a l threade ts The r njpa id a manual manipulated; u a tomati al per te m ehinehavme a xteribily t xe led nt n erchangea le a ic tor a t 9 7 x 34 Is if a e i -meted me ei a i a e mach ne Wi her having. means for rotating; the, mandrel into a hollow rivet preparatory to insta.- in a hole drilled in the work, co means. for retracting the mandrel cnllaps'jngliioxcebn the mfiiejrm to permane y iidtheq .ts e t r.saia mandrelfrotating ine n svbein rLeYefsiTiletQ t 313?use memento r' m 'the lt v Another obistt o 'the. nvention is,.'to. provide. a

machine ior quiet andx gre pu 'i 1 w iivet yiii bli 1h nee ej isi e'pi ia g 0"; are ipr cag squeezing unitfan r ta u i imfifi j al 915-91 9 i a h e n mea pefide ll litr e 0 o twain he summe 1 r was lc' S. and for w thdrawing the in J drrf'ro tHenTeti r et M rwietfr ivi's s a e metered-1 jus trnent' iii the strokelengtlr of the; reeiprocal squeezing unitto adoptthe's'ame'to-iiv'ets' dr ven} ous lengths.

' Withthe; foregoing and other; objects in vievv,

the invention has ammerrefe ence-t certain features 'of accom lishment; to bedding ifest as the description roceeds; ken inoonnectmn' with the acbnlflallyill dfaWlng Whieifii tool constructed accordifig to the invention.

Figure 2 is: a topplan iiiew of-that-partefi the tool 'forwa'rdlyofand omitting; the motivating unitaand" a Figure 3 is: av vertical sectional: view. taken on l-ine. 3=3won:Fig-ure 1.. Continuing with a. moredetailed description ofithedrawing, reference numeral ll denotes'gerierallyi'the'v heart or forepartof thesrivetinstalling machine whichi'isafllxed, bylmealns of 'bolt's: H- to aplate; 12, the latter, in; turn, "extending ironrthev head of conventional squeezing: 5001; not claiin is; made; herein to the, squeezing;-toolistmcturaily pumrather; to: its; function. on that of; equlyalent b. 9 a" he: nve tion '19; P e- 35 Figure 1 is a longitudinal seet ens tie tra 2 means tor exerting a collapsing force on. a. rivet inia manner tofbe presently described.

' The sciueezing tool, as shown, consists; oi a cyl inder l3: in which operates a pistonll, thelatter carrying a'carn' plate I 51 Thecylinde l 3 merges into a'hody "leg, from which t n n ountlng plate "t2 extends and to which latter, as statedis attaehed the'head of the rivet installing na chine. It is the purpose of the squeege tool to reciprocate a plunger ll forl a purpose tobepres-r ently'rnade hear"; Th plunger 1 :1; is reciprocally ni i u h '8 in he head and sPrQr' vicfled' itselfwith a 'head l9, against hears ategapr'essionsprmg 20, the opposite endof. the r n e a a n and i he bushing t to: no mal y u e t e p un er i arwar v di ect ion. With the plunger l-l in'retraeted posit on a i k 2t shown n a a i m n w thend abiif nt.- he ead: o t enluneer, i be. disposed man angular plane in relation thereto so that its roller 22 will bear against the cam surface 2-3 ot the cam plate l5 with the latter retracted. When; air. is admitted into cylinder l3 by opening a valve 24 piston l4 therein is advanced, urging theoam plate- I 5fin a forwardly direction toi-exert a-force on the, link 21 which will loe displacedin such;l:oanner as to impose; an axial thrust. upon the plunger I11; against the resistance of spring 2 0.; Since thessqueezetoolis of conventional const mt iom a; et led ex lanation of its compositipn and function is not considered necessary as these; are well within, the knowledge of those skilled: in the, art.

Affixed tothe squeeze toolbody. l6;andcooperating therew t in a a r: to pr sently 'exs areversible rotary unit which, in the presentncase consists of a conventional pneumatic screw: drivi figmachiie. This; unit is. comprised of ahousing 25 containinaneairmzor, whichtis not shown; in; View; of its. well known. constrwn; but

which? imparts; rotation to a shaft 26 emerging imm'the forward end oflthehousing 25.7 air inlet. tube 21. enters the housing atits reanendLto operatethe motor inr'the housing. u

A lever 28 is; mounted on the. housing; 25 to: the; purpose of. actuating a valve 29 to introduce ai-nintcr-the.casing'25ifordriving the2motor therein normally: revolves shaft" 26. in. a clockwise direction. To reverse. the. direction of rotation of the shaft 26, a lever 30 is located on: the side of the housing 25. adapted in the manner described, being of standard construction, has not been illustrated in detail since its construction, assembly and function are well known.

Referring now specifically to the actual rivet installing mandrel and the relationship therewith of the rotary and reciprocating units described, it will be observed in Figures 1 and 2 that the head In is disposed at a slight angle in relation to the longitudinal axis of the tool as a whole and is formed with a boss 3| having an axial bore throughv which extends the mandrel 32. This mandrel consists of a case hardened shaft whose outer end is threaded at 33 and on its opposite end is formed a head 34.

A slidable carriage 35 is mounted on the head having an unstanding leg 36 at right angles-" to the body thereof, in which is formed a cavity- 31 receiving the h'ead 34 of the mandrel 32. An.

undercut groove 38 is formed in theinclinecl upper surface of the head The screw driving machine ID to receive the flanged TI I base of the carriage 35 and holds the. latter against other than reciprocative displacement on the head. Bearing against the rear end of the carriage 35 is a coiled spring 39, normally urging the carriage in a forwardly direction to exert a forward thrust on the mandrel 32, by virtue of a pinion 4i], afiixed to the mandrel and lying in an oblong recess 4| (Fig. 3) in the facial portion of the carriage leg 33. A plate 42 overlies the spring 39 enclosing the same against dust and foreign matter.

Disposed also in the oblong recess 4| is a pinion 42 of analogous diameter to and enmeshing pinion 40. This pinion 42 is mounted on the end of a shaft 43, spaced from but disposed parallel to the inclined upper surface of the head I 0. The upper end of shaft 43 is slidably retained in a sleeve 44 by means of a pin 45 on the shaft which enters a longitudinal slot 43 in the sleeve. The sleeve 44 is a part of a universal joint consisting of the sleeve and a complementary sleeve 41, mounted on the end of the shaft 26 of the air motor contained in the housing of the rotary unit. In order thatthe mandrel 32 may be reciprocated, this motion is applied to the carriage 35 by means of a lever 48 which is pivoted in a cavity 49 in the head III by means of a transverse pin 50. The upper end of the lever operates in a recess 5| in the underside of the carriage 35 and its opposite end is engaged by the protruding end of the plunger I! of the squeeze tool earlier described. Thus it will be seen that as the plunger I1 is advanced against the lower and rounded end 52 of the lever 48, the latter will be rocked on its pivot and will move the carriage 35 rearwardly against the resistance of spring '39, thereby retracting the mandrel 32 to accomplish the function to be presently explained.

The type of rivet adaptedtobe installed by the described invention-is shown in longitudinal section in Figure 1 as securing together juxtapositioned work pieces 53 and it will be assumed --than; the. side of the work assem-blyopposite-the' tool is inaccessible or blind. The rivet 54, consists of a hollow, cylindrical body, interiorly threaded a predetermined depth opposite its head 55 which may be convex as shown, or other shapes. The boss 3| of the head lfl has a recess 56 of a shape corresponding to the type of head on therivet so that the head will lie wholly or partly in the recess.

To fasten the rivet in a hole, drilled through the juxtapositioned plates 53, the rivet is first placed on the threaded end 33 of the mandrel 32 while the latter is being rotated by the air motor of the rotary unit in a clockwise direction through the shaft 43. The rivet, while mounted on the mandrel, is thrust into the hole, whereupon the valve 24 of the squeeze tool is opened to introduce air under pressure into the cylinder, actuating its piston'l l, thus advancing the cam I5 against the roller 22 of link 2| to exert a forward thrust on plunger 11. The forward end of plunger I! bearsagainst,thelever.48 31; its lower end to -rock the same-on ft's pivot; thereby retracting the mandrel 32 witha force sumcient V. to collapse the walls of the rivet 54, creating an annular head 51 therein flush against the inner 'plate of the work "assembly 53 on the "blind side thereof.

After satisfactorily clinching the rivet 54 in the manner described, the direction of rotation of the mandrel 32 is reversed by actuating the lever 300:; the side of rotary unit housing 25. This action reverses the air motor which drives gears 40 and 42 in the opposite direction through shaft 43, causing the inandrelto bedriven, by means of pinion 42in a counter-clockwise direction which retracts the same from the threads of the rivet 54, leaving the latter intact in the work pieces, binding them in fixed relationship.

' 'Man'iiestlmthe construction as shown and described is capable of some modification and such modification as may be construed to fall within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is: V

1. Apparatus for installing hollow, internally threaded rivets including a body having a head provided with an undercut track, a threaded mandrel rotatably'and reciprocally mounted on said head to threadedly receive a'rivet and having a gear on one endfthereof, a carriage slidable on said trackfor actuating said mandrel, an air motor carried by said body, an extensible shaft operated by said air motor having a gear en.- gaging the gearof said mandrel for rotating said mandreljto engage a rivet, means in saidbody for retracting: said carriage to correspondingly movesaid motor shaft and mandrel to collapse saidrivet in a work piece assembly and means for reversing said air motor to effect threaded withdrawal of said mandrel from the installed rivet.

threaded rivets includingabody having a head, acarriage held against other than longitudinal sliding movement on andexteriorly of saidhead, an air motormounted on said 'head, an extensible shaft operated .thereby having a gear thereon, a

-gear of said-motor shafirfor matings-mamas:

drel means in saidbody for actuating said carriage for imposing. a collapsing force on said rivetaby-retracting said mandrel and means for reversing the directionof rotation of said air motorrto effect withdrawalofthe mandrel from the collapsed rivet.

3. :Apparatus for installing hollow interiorly threaded rivets'including a body having a head,-

2. Apparatus forinstalling hollow, internally.

a carriage slidably disposed on said head, a threaded mandrel rotatably and reciprocally mounted in said head and actuated by said carriage, a gear mounted on one end of said mandrel, a reversible air motor mounted on said body, an extensible shaft actuated by said motor having a gear engaging the gear of said mandrel for rotating saidmandrel to receive a rivet, means for retracting said carriage to exert a pull on said mandrel, effective to collapse said rivet intermediate its ends in juxtapositioned work pieces and means for reversing said air motor to effect withdrawal of said mandrel from an installed rivet.

EDGAR HILER.

REFERENCES CITED 0 Number Name Date 2,283,665 Cadden May 19, 1942 2,283,708 Trautmann May 19, 1942 

